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        <p>When filled, a comment in the merge request completely matching this regular expression will trigger a build.
           Note this uses default <a href="https://docs.oracle.com/javase/8/docs/api/java/util/regex/Pattern.html">Java regex syntax</a>.
           Notably <code>^</code> and <code>$</code> only match at the start/end of the whole comment, and <code>.</code> doesn't match newlines.
           You might want to <a href="https://docs.oracle.com/javase/tutorial/essential/regex/pattern.html#embedded">embed syntax-modifying flags</a> like <code>(?m)</code> <code>(?s)</code> to change these.</p>
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